Introduction
With the increasing development of renewable energy projects, medium voltage (MV) switchgear has become an essential part of solar power plant substations. It provides reliable power distribution, switching, protection, and monitoring functions to support the safe operation of renewable energy systems.
The switchgear cost for solar power plants depends on various factors, including voltage level, switchgear type, protection requirements, project specifications, and manufacturing capability. Understanding these factors helps project owners and EPC contractors evaluate the overall investment of solar substation equipment and select a suitable MV switchgear solution.
Recently, Haocheng Electric conducted a technical exchange with an overseas customer regarding a 40MW solar PV application in Afghanistan. The customer visited Haocheng Electric’s factory to evaluate manufacturing capability and discuss the requirements for a 20kV MV switchgear solution.
What Factors Affect Switchgear Cost for Solar Power Plants?
The cost of MV switchgear for solar applications is influenced by several technical and project-related factors.
1. Voltage Level and Switchgear Type
Voltage level is one of the key factors affecting MV switchgear selection and cost. When evaluating solar power plant switchgear cost, the voltage class and insulation level are usually the first considerations during equipment selection.
Solar power plant substations commonly use medium voltage switchgear classes such as 12kV, 24kV, and 36kV, depending on system voltage and project requirements.
For 20kV power systems, 24kV-class switchgear is commonly selected to provide suitable insulation capability and reliable operation according to applicable standards. Medium voltage switchgear design, testing, and performance requirements are commonly referenced from international standards such as IEC 62271.
For the solar PV application under technical discussion, the customer required:
| Parameter | Specification |
|---|---|
| Switchgear Type | KYN28-24 Metal-clad Withdrawable Switchgear |
| Rated Voltage | 24kV |
| Rated Current | 630A (specified panels) |
| Application | 20kV MV switchgear section for solar substation |
The final switchgear configuration is determined based on detailed engineering requirements and project specifications.
2. Configuration and Protection Requirements
The configuration of MV switchgear varies depending on each solar project.
Factors that influence the switchgear arrangement include:
- Solar plant capacity
- Substation design
- Grid connection requirements
- Protection coordination
- EPC and owner specifications
Depending on project requirements, MV switchgear lineups may include different functional panels, such as feeder panels, metering panels, and protection-related panels.
For the 40MW solar PV application discussed with the customer, the preliminary requirements included functional sections such as incoming feeder, outgoing feeder, and metering applications.
Protection requirements also have a direct impact on switchgear cost for solar power plants.
Through protection relays and control systems, MV switchgear may be designed with functions such as:
- Overcurrent protection
- Earth fault protection
- Voltage protection
- Measurement and communication functions
The protection scheme is normally customized according to local grid requirements, utility standards, and project specifications.
3. Manufacturing Capability and Quality Control
For renewable energy projects, choosing the right MV switchgear manufacturer is not only about product specifications but also manufacturing capability and engineering support.
A reliable supplier should have strong capabilities in:
- Product design
- Sheet metal fabrication
- Copper busbar processing
- Switchgear assembly
- Routine testing and quality inspection
During the factory visit, the overseas customer reviewed Haocheng Electric’s production facilities and manufacturing processes to evaluate the company’s capability for international power distribution projects.
20kV MV Switchgear Solution for a 40MW Solar PV Application
Based on the customer’s preliminary technical requirements, Haocheng Electric discussed a KYN28-24 metal-clad withdrawable switchgear solution for a 40MW solar PV application.
The project information includes:
| Item | Details |
|---|---|
| Application | 20kV MV switchgear section for solar substation |
| Project Type | 40MW Solar PV Application |
| MV System Voltage | 20kV |
| Switchgear Model | KYN28-24 |
| Rated Voltage | 24kV |
| Rated Current | 630A (specified panels) |
| Substation Interface | 110/20kV Substation |
The proposed solution focuses on:
- Reliable medium voltage switching
- Safe operation and protection coordination
- Flexible configuration based on project requirements
- Compliance with technical specifications
Overseas Customer Visit to Haocheng Electric
For international solar projects, customers usually evaluate both technical solutions and supplier capabilities before supplier selection.
During the factory visit, the customer focused on:
MV Switchgear Manufacturing Process
Including:
- Cabinet fabrication
- Busbar processing
- Component assembly
- Electrical wiring
- Quality inspection procedures
Engineering Support Capability
In addition to manufacturing, MV switchgear projects require professional technical support, including:
- Technical specification review
- Customized solution design
- Project communication
- Production coordination
Haocheng Electric combines manufacturing capability with engineering experience to support global customers in medium voltage power distribution projects.
How to Select the Right MV Switchgear Supplier for Solar Projects?
When selecting an MV switchgear supplier for solar power plants, customers should consider:
Technical Experience
The supplier should understand renewable energy applications, MV distribution systems, and project-specific requirements.
Manufacturing Capability
A professional production facility and quality control system help ensure reliable equipment performance.
Customized Solution Capability
Each solar project has different electrical requirements. The ability to provide customized MV switchgear solutions is essential for successful project execution.
Conclusion
The switchgear cost for solar power plants is influenced by multiple factors, including voltage class, switchgear configuration, protection requirements, and manufacturing capability.
For utility-scale solar applications, selecting a reliable 20kV MV switchgear solution is critical for safe and stable operation.
Through technical discussions and factory evaluation, Haocheng Electric provides customized MV switchgear solutions for renewable energy projects worldwide.
